JPS5863811A - Dry type gas meter - Google Patents

Abstract

PURPOSE:To obtain a safety dry type gas meter without a solenoid valve by airtightly isolating an elecromagnetic coil operating a detaining mechanism to check rotational motion obtained by converting the reciprocating motion of a measuring film. CONSTITUTION:At a normal time, a permanent magnet 23 fitted to the other end of a detaining piece 22 is attracted by a fixed iron core 25 of an electromagnetic device, so that the rotational motion of a crank board 17 based upon the reciprocating motion of a measuring film 11 is carried out without troubles because a pawl part 22' is located under the crank board 17 and gas is sent from a gas meter while being measured. If current having a polarity checking the attracting power of the permanent magnet 23 is supplied to an electromagnetic coil 26 even in a moment, a pawl part 22' projected up to the rotational height of the crank board 17 and abutted to an engaging part 17', so that rotation is stopped and the reciprocating motion of the measuring film 11 is also stopped to interrupt gas feeding. Since the electromagnetic coil 26 is isolated on the atmospheric side by sealing a fixed iron core 25 penetrated into the wall surface of a mechanical room 30 by an O-ring, the whole gas meter system is safely prevented from flashed explosion.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dry gas meter incorporating a gas shutoff mechanism in case of an emergency.

In the case of an emergency shutoff of gas in indoor gas piping for some reason, it is common practice to turn off the main valve installed on the inlet side of the gas meter, but it is common practice to turn off the main valve installed on the inlet side of the gas meter, but it is also common to turn off the main valve installed on the inlet side of the gas meter. In order to stop the main valve in conjunction with a shut-off signal from the main valve, a solenoid valve is generally used as the main valve. However, solenoid valves are expensive, require a lot of work to install in the middle of piping, require additional space, and require modification of existing piping, which can lead to limited space. There were drawbacks such as installation being impossible due to lack of gas supply, and customers being forced to stop using gas for long periods of time.

In view of the points mentioned above, the present invention provides three...
-0・Incorporates a gas cutoff mechanism that allows gas to be cut off using an electrical signal, and with a configuration that isolates live parts from the gas atmosphere, it is extremely safe and has no risk of ignition or explosion due to electrical sparks. The purpose is to realize a gas meter.

That is, a transmission mechanism that converts the reciprocating motion of the metering membrane into rotational motion and transmits it to the indicating mechanism, a locking mechanism that blocks the movement of the metering membrane or the movement of the transmission mechanism, and an electromagnetic mechanism that operates this locking mechanism. The electrical components such as the electromagnetic coil of the electromagnetic device, so-called live parts, are airtightly isolated from the gas atmosphere of a measuring chamber housing a measuring membrane or a mechanism room housing a transmission mechanism. It is composed of

The present invention will be described in detail below based on examples.

The figure shows an embodiment of a dry gas meter according to the present invention, and the gas meter has a depletion chamber case 1. Upper case 2. The outer shape is formed by the controller case 4 and belly plate 6 located before and after the indicator case 3 and the metering chamber case 1. Upper case 2 has gas population 6
A gas outlet lower is formed, and the indicator case 3 has a display window 8 for reading the amount of gas used. A control lid 9 prevents rainwater from entering the front side of the controller case 4, and an inspection window 10 is also provided in this area to check the operating status. All of these windows are fitted with glass.

The operating principle and mechanism of a dry gas meter are the same as those of the conventional one, so they will not be described in detail. However, an example of an embodiment of the present invention having a built-in shutoff function will be described below with reference to FIGS. 4 and 5.

The reciprocating motion of the metering membrane 11 is caused by the blade shaft 13 via the vane plate 12.
13', large elbow 14, 14' and small elbow 15
, 15', first crank plate 16, second crank plate 1
7 into rotational motion. This movement is the connecting plate 1
8 and 18' to valves 19 and 19', and these valves 19 and 19' rotate by appropriately applying gas to the metering membrane 11 and another metering membrane 11', not shown. Exercise continues. The rotational motion is decelerated by the gearbox 20 and transmitted to the output shaft 21.

57.-4-. This rotation of the output shaft 21 is transmitted to the indicator mechanism in the indicator case 3 to display the gas consumption amount, but since this part is a well-known structure, the explanation will be omitted.

Now, the shutoff operation will be explained next. The second crank plate 17 has an engaging part 17' that protrudes outward from the gearbox 2o and rotates, and a claw part 22' of a locking piece 22 pivotally supported by the output shaft 21 is connected to the second crank plate 17. The permanent magnet 23 provided at the other end of the locking piece 22 is located within the rotational movement range of the plate 17, and in normal operation, the fixed iron core 2 of the electromagnetic device 24
5, the claw part 22 is attracted as shown in Fig. 6.
' is located below the second crank plate 17. Therefore, the gas is metered and sent out from the gas meter without being affected by rotational movement. Next, when a current with a polarity that cancels the attraction force of the permanent magnet 23 is supplied to the electromagnetic coil 26 of the electromagnetic device 24 even for a moment, the locking piece 22 rotates counterclockwise in FIG. ' protrudes at rotational height 1 of the second crank plate 17, and the retaining part 17' and the pawl 22
Rotation is prevented in the state 67.-2. in which ′ is in contact. The state of the locking piece 22 at this time is
Indicated by the two-dot chain line in the figure. When rotation is interrupted, valve 19
, 19' is eliminated, the reciprocating movement of the metering membrane 11, 11' is also stopped, and the gas supply can be cut off. The locking piece 22 is designed so that in its natural state, the left side in FIG. You can do less. It is also possible to prevent the locking piece 22 from coming off naturally from the locked state to the rotatable state.

Next, when returning the locking piece 22 to the left side, the cam 27
Since the cam 27 is rotated counterclockwise in FIG. 5 by the cam shaft 28, the locking piece 22 is rotated clockwise, and finally the pawl 22' and the engaging portion 17 ' is released from the locked state, and is attracted to the fixed iron core 26 of the electromagnetic device 24 by the force of the permanent magnet 23. This will return the system to normal as shown in Figure 6. A pin 29 is driven into the camshaft 28, and rotational force is applied by a reset knob 29 provided at a corresponding position on the upper case 2.

7.--1. To facilitate assembly, a mechanism that can be divided into parts and transmits only rotational force, such as a universal joint, is suitable here.

Wing shaft 13.13 converting the motion of the metering membrane 11 into rotational motion
', a transmission mechanism composed of large and small armrests 14, 14', 16, 16', two crank plates 16, 17, etc., a retaining part 17' of the second crank plate 17, and a locking piece 22.
Both of the locking mechanisms are provided in a mechanism chamber 30 enclosed by the upper case 2, which is filled with gas and communicates with the gas port 6. Electromagnetic coil 26 of electromagnetic device 24
is supplied with current from a control device 31 (not shown) in the controller case 9 at the time of interruption. The electromagnetic coil 26 connects the fixed iron core 25 that penetrates the wall of the mechanism chamber 30 with the O-ring 3.
2, since it is fixed to the atmosphere side and is airtightly isolated, even if an electrical discharge spark occurs, it is completely isolated from the gas atmosphere and there is no fear of the gas igniting or exploding. 1. The electromagnetic device 24 according to one embodiment of the present invention includes a yoke plate 33 on the outside of the electromagnetic coil 26, and an auxiliary yoke 34.
is provided between the yoke plate 33 and the permanent magnet 23, and the magnetic gap 35 is very narrow, creating a magnetic circuit with low magnetic resistance, so the power required for disconnection can be extremely reduced, making it possible to disconnect using a battery. It became. In addition, the fixed core 25 in Figure 5
The yoke plate 33 is fixed by tightening, and the auxiliary yoke 34 is fixed.
It penetrates through the second case 2, is hermetically sealed with an O-ring 32', and is fastened to the yoke plate 33 with screws 36. Further, in the embodiment shown in FIG. 5, the permanent magnet 23 is provided at the end of the movable part of the locking mechanism, the so-called locking piece 22, and the fixed iron core of the electromagnetic device 24 is moved to a position corresponding to the permanent magnet 23. 26 is provided in order to cancel the attractive force of the permanent magnet 23 by applying an instantaneous current to the electromagnetic coil 26 and simply rotating the locking piece 23 in the counterclockwise direction, the locking piece 23 can be interrupted. The accompanying frictional resistance is also extremely small, and compared to, for example, a movable plunger type electromagnetic device, reliable fast-acting operation can be achieved with low friction.

As described above, the present invention not only adds a shutoff function to the gas meter itself and can obtain the same function without the need for a separate solenoid valve, but also has a locking mechanism. Since the electromagnetic coil of the electromagnetic device that operates the device is configured to be isolated from the gas atmosphere, it is possible to realize a safe dry gas meter without the risk of gas ignition or explosion due to electrical sparks or the like.

In this text, only a fixed core type electromagnetic device has been described, but the object of the present invention is not limited to this, and similar effects can be obtained with electromagnetic devices of other types.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a gas meter showing an embodiment of the present invention;
Figure 2 is a front view of the same gas meter. Figure 53 is a left side view of the same gas meter, Figure 4 is a plan view of the same gas meter with the upper case and controller case removed, and Figure 5 is a view of the gas meter with the upper case and controller case removed. FIG. 3 is a cross-sectional front view of the electromagnetic device. 11...Metric membrane, 13, 13'...
Wing axis, 14° 14'...Dog elbow, 15, 15
'...Small elbow metal, 16...1st crank plate, 17...2nd crank plate, 17'...
...Engaging part, 22...Locking piece, 23...
Permanent 10-beam ζ magnet, 24... electromagnetic device, 25... fixed iron core,
26... Electromagnetic coil, 3o... Mechanism room,
32.32'...○Ring, 33...
Yoke plate, 34...Auxiliary yoke. Name of agent: Patent attorney Toshio Nakao Haga 1 person No. 3
Figure 4 2Q23 / (Q'13 °
00 ■ ■ 0 0 ■ ・ 0 4 f3 0. 0? 9 28222f /7' (q Fig. 5 G ,, 23. t8 Δ 151522 f622' 5 235 f'1 -'20

Claims (4)

[Claims] (1) A transmission mechanism that converts the reciprocating motion of the metering membrane into rotational motion and transmits it to the indicating mechanism, a locking mechanism that blocks the movement of the metering membrane or the movement of the transmission mechanism, and operating the locking mechanism. an electromagnetic device, the electromagnetic coil of the electromagnetic device being airtightly isolated from a measurement chamber housing the measurement membrane or a mechanism chamber housing the transmission mechanism. (2) The dry gas meter according to claim 1, wherein the movable part of the locking mechanism has a permanent magnet, and the fixed core of the electromagnetic device is positioned in correspondence with the permanent magnet. (3) A dry gas meter according to claim 1, wherein a fixed core of the electromagnetic device is provided to penetrate a wall surface of the mechanism chamber, and the penetrating portion of the fixed core is made airtight with a circle. , (4) The electromagnetic device includes an electromagnetic coil, a fixed iron core at the center of the electromagnetic coil, and a yoke plate outside the electromagnetic coil, 2, -2
- The dry gas meter according to claim 2, comprising an auxiliary yoke provided between the permanent magnet of the locking mechanism and the yoke plate.